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Comparing jsr166/src/test/tck/SynchronousQueueTest.java (file contents):
Revision 1.11 by jsr166, Mon Nov 16 04:57:10 2009 UTC vs.
Revision 1.68 by dl, Tue Jan 26 13:33:06 2021 UTC

#	Line 1 | Line 1
1		/*
2		* Written by Doug Lea with assistance from members of JCP JSR-166
3		* Expert Group and released to the public domain, as explained at
4	<	* http://creativecommons.org/licenses/publicdomain
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5		* Other contributors include Andrew Wright, Jeffrey Hayes,
6		* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import static java.util.concurrent.TimeUnit.MILLISECONDS;
10
11	<	public class SynchronousQueueTest extends JSR166TestCase {
11	>	import java.util.ArrayList;
12	>	import java.util.Arrays;
13	>	import java.util.Collection;
14	>	import java.util.Iterator;
15	>	import java.util.NoSuchElementException;
16	>	import java.util.concurrent.BlockingQueue;
17	>	import java.util.concurrent.CountDownLatch;
18	>	import java.util.concurrent.Executors;
19	>	import java.util.concurrent.ExecutorService;
20	>	import java.util.concurrent.SynchronousQueue;
21
22	<	public static void main(String[] args) {
17	<	junit.textui.TestRunner.run (suite());
18	<	}
22	>	import junit.framework.Test;
23
24	<	public static Test suite() {
25	<	return new TestSuite(SynchronousQueueTest.class);
24	>	public class SynchronousQueueTest extends JSR166TestCase {
25	>
26	>	public static class Fair extends BlockingQueueTest {
27	>	protected BlockingQueue emptyCollection() {
28	>	return new SynchronousQueue(true);
29	>	}
30		}
31
32	<	/**
33	<	* A SynchronousQueue is both empty and full
34	<	*/
35	<	public void testEmptyFull() {
28	<	SynchronousQueue q = new SynchronousQueue();
29	<	assertTrue(q.isEmpty());
30	<	assertEquals(0, q.size());
31	<	assertEquals(0, q.remainingCapacity());
32	<	assertFalse(q.offer(zero));
32	>	public static class NonFair extends BlockingQueueTest {
33	>	protected BlockingQueue emptyCollection() {
34	>	return new SynchronousQueue(false);
35	>	}
36		}
37
38	<	/**
39	<	* A fair SynchronousQueue is both empty and full
37	<	*/
38	<	public void testFairEmptyFull() {
39	<	SynchronousQueue q = new SynchronousQueue(true);
40	<	assertTrue(q.isEmpty());
41	<	assertEquals(0, q.size());
42	<	assertEquals(0, q.remainingCapacity());
43	<	assertFalse(q.offer(zero));
38	>	public static void main(String[] args) {
39	>	main(suite(), args);
40		}
41
42	<	/**
43	<	* offer(null) throws NPE
44	<	*/
45	<	public void testOfferNull() {
50	<	try {
51	<	SynchronousQueue q = new SynchronousQueue();
52	<	q.offer(null);
53	<	shouldThrow();
54	<	} catch (NullPointerException success) { }
42	>	public static Test suite() {
43	>	return newTestSuite(SynchronousQueueTest.class,
44	>	new Fair().testSuite(),
45	>	new NonFair().testSuite());
46		}
47
48		/**
49	<	* add(null) throws NPE
49	>	* Any SynchronousQueue is both empty and full
50		*/
51	<	public void testAddNull() {
52	<	try {
53	<	SynchronousQueue q = new SynchronousQueue();
54	<	q.add(null);
55	<	shouldThrow();
56	<	} catch (NullPointerException success) { }
51	>	public void testEmptyFull()      { testEmptyFull(false); }
52	>	public void testEmptyFull_fair() { testEmptyFull(true); }
53	>	public void testEmptyFull(boolean fair) {
54	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
55	>	assertTrue(q.isEmpty());
56	>	mustEqual(0, q.size());
57	>	mustEqual(0, q.remainingCapacity());
58	>	assertFalse(q.offer(zero));
59		}
60
61		/**
62		* offer fails if no active taker
63		*/
64	<	public void testOffer() {
65	<	SynchronousQueue q = new SynchronousQueue();
64	>	public void testOffer()      { testOffer(false); }
65	>	public void testOffer_fair() { testOffer(true); }
66	>	public void testOffer(boolean fair) {
67	>	SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
68		assertFalse(q.offer(one));
69		}
70
71		/**
72	<	* add throws ISE if no active taker
72	>	* add throws IllegalStateException if no active taker
73		*/
74	<	public void testAdd() {
75	<	try {
76	<	SynchronousQueue q = new SynchronousQueue();
77	<	assertEquals(0, q.remainingCapacity());
78	<	q.add(one);
84	<	shouldThrow();
85	<	} catch (IllegalStateException success){
86	<	}
87	<	}
88	<
89	<	/**
90	<	* addAll(null) throws NPE
91	<	*/
92	<	public void testAddAll1() {
74	>	public void testAdd()      { testAdd(false); }
75	>	public void testAdd_fair() { testAdd(true); }
76	>	public void testAdd(boolean fair) {
77	>	SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
78	>	mustEqual(0, q.remainingCapacity());
79		try {
80	<	SynchronousQueue q = new SynchronousQueue();
95	<	q.addAll(null);
80	>	q.add(one);
81		shouldThrow();
82	<	}
98	<	catch (NullPointerException success) {}
82	>	} catch (IllegalStateException success) {}
83		}
84
85		/**
86	<	* addAll(this) throws IAE
86	>	* addAll(this) throws IllegalArgumentException
87		*/
88	<	public void testAddAllSelf() {
88	>	public void testAddAll_self()      { testAddAll_self(false); }
89	>	public void testAddAll_self_fair() { testAddAll_self(true); }
90	>	public void testAddAll_self(boolean fair) {
91	>	SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
92		try {
106	–	SynchronousQueue q = new SynchronousQueue();
93		q.addAll(q);
94		shouldThrow();
95	<	}
110	<	catch (IllegalArgumentException success) {}
95	>	} catch (IllegalArgumentException success) {}
96		}
97
98	<	/**
99	<	* addAll of a collection with null elements throws NPE
115	<	*/
116	<	public void testAddAll2() {
117	<	try {
118	<	SynchronousQueue q = new SynchronousQueue();
119	<	Integer[] ints = new Integer[1];
120	<	q.addAll(Arrays.asList(ints));
121	<	shouldThrow();
122	<	}
123	<	catch (NullPointerException success) {}
124	<	}
125	<	/**
126	<	* addAll throws ISE if no active taker
98	>	/**S
99	>	* addAll throws IllegalStateException if no active taker
100		*/
101	<	public void testAddAll4() {
101	>	public void testAddAll_ISE()      { testAddAll_ISE(false); }
102	>	public void testAddAll_ISE_fair() { testAddAll_ISE(true); }
103	>	public void testAddAll_ISE(boolean fair) {
104	>	SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
105	>	Item[] items = seqItems(1);
106	>	Collection<Item> coll = Arrays.asList(items);
107		try {
108	<	SynchronousQueue q = new SynchronousQueue();
131	<	Integer[] ints = new Integer[1];
132	<	for (int i = 0; i < 1; ++i)
133	<	ints[i] = new Integer(i);
134	<	q.addAll(Arrays.asList(ints));
108	>	q.addAll(coll);
109		shouldThrow();
110	<	}
137	<	catch (IllegalStateException success) {}
110	>	} catch (IllegalStateException success) {}
111		}
112
113		/**
141	–	* put(null) throws NPE
142	–	*/
143	–	public void testPutNull() {
144	–	try {
145	–	SynchronousQueue q = new SynchronousQueue();
146	–	q.put(null);
147	–	shouldThrow();
148	–	}
149	–	catch (NullPointerException success){
150	–	}
151	–	catch (InterruptedException ie) {
152	–	unexpectedException();
153	–	}
154	–	}
155	–
156	–	/**
114		* put blocks interruptibly if no active taker
115		*/
116	<	public void testBlockingPut() {
117	<	Thread t = new Thread(new Runnable() {
118	<	public void run() {
119	<	try {
120	<	SynchronousQueue q = new SynchronousQueue();
121	<	q.put(zero);
122	<	threadShouldThrow();
123	<	} catch (InterruptedException ie){
124	<	}
125	<	}});
126	<	t.start();
127	<	try {
128	<	Thread.sleep(SHORT_DELAY_MS);
172	<	t.interrupt();
173	<	t.join();
174	<	}
175	<	catch (InterruptedException ie) {
176	<	unexpectedException();
177	<	}
178	<	}
179	<
180	<	/**
181	<	* put blocks waiting for take
182	<	*/
183	<	public void testPutWithTake() {
184	<	final SynchronousQueue q = new SynchronousQueue();
185	<	Thread t = new Thread(new Runnable() {
186	<	public void run() {
187	<	int added = 0;
188	<	try {
189	<	q.put(new Object());
190	<	++added;
191	<	q.put(new Object());
192	<	++added;
193	<	q.put(new Object());
194	<	++added;
195	<	q.put(new Object());
196	<	++added;
197	<	threadShouldThrow();
198	<	} catch (InterruptedException e){
199	<	assertTrue(added >= 1);
200	<	}
201	<	}
202	<	});
203	<	try {
204	<	t.start();
205	<	Thread.sleep(SHORT_DELAY_MS);
206	<	q.take();
207	<	Thread.sleep(SHORT_DELAY_MS);
208	<	t.interrupt();
209	<	t.join();
210	<	} catch (Exception e){
211	<	unexpectedException();
212	<	}
213	<	}
214	<
215	<	/**
216	<	* timed offer times out if elements not taken
217	<	*/
218	<	public void testTimedOffer() {
219	<	final SynchronousQueue q = new SynchronousQueue();
220	<	Thread t = new Thread(new Runnable() {
221	<	public void run() {
222	<	try {
223	<
224	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
225	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
226	<	threadShouldThrow();
227	<	} catch (InterruptedException success){}
228	<	}
229	<	});
116	>	public void testBlockingPut()      { testBlockingPut(false); }
117	>	public void testBlockingPut_fair() { testBlockingPut(true); }
118	>	public void testBlockingPut(boolean fair) {
119	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
120	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
121	>	Thread t = newStartedThread(new CheckedRunnable() {
122	>	public void realRun() throws InterruptedException {
123	>	Thread.currentThread().interrupt();
124	>	try {
125	>	q.put(ninetynine);
126	>	shouldThrow();
127	>	} catch (InterruptedException success) {}
128	>	assertFalse(Thread.interrupted());
129
130	<	try {
131	<	t.start();
132	<	Thread.sleep(SMALL_DELAY_MS);
133	<	t.interrupt();
134	<	t.join();
135	<	} catch (Exception e){
136	<	unexpectedException();
137	<	}
130	>	pleaseInterrupt.countDown();
131	>	try {
132	>	q.put(ninetynine);
133	>	shouldThrow();
134	>	} catch (InterruptedException success) {}
135	>	assertFalse(Thread.interrupted());
136	>	}});
137	>
138	>	await(pleaseInterrupt);
139	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
140	>	t.interrupt();
141	>	awaitTermination(t);
142	>	mustEqual(0, q.remainingCapacity());
143		}
144
241	–
145		/**
146	<	* take blocks interruptibly when empty
147	<	*/
148	<	public void testTakeFromEmpty() {
149	<	final SynchronousQueue q = new SynchronousQueue();
150	<	Thread t = new Thread(new Runnable() {
151	<	public void run() {
152	<	try {
153	<	q.take();
154	<	threadShouldThrow();
155	<	} catch (InterruptedException success){ }
156	<	}
157	<	});
255	<	try {
256	<	t.start();
257	<	Thread.sleep(SHORT_DELAY_MS);
258	<	t.interrupt();
259	<	t.join();
260	<	} catch (Exception e){
261	<	unexpectedException();
262	<	}
263	<	}
146	>	* put blocks interruptibly waiting for take
147	>	*/
148	>	public void testPutWithTake()      { testPutWithTake(false); }
149	>	public void testPutWithTake_fair() { testPutWithTake(true); }
150	>	public void testPutWithTake(boolean fair) {
151	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
152	>	final CountDownLatch pleaseTake = new CountDownLatch(1);
153	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
154	>	Thread t = newStartedThread(new CheckedRunnable() {
155	>	public void realRun() throws InterruptedException {
156	>	pleaseTake.countDown();
157	>	q.put(one);
158
159	+	Thread.currentThread().interrupt();
160	+	try {
161	+	q.put(ninetynine);
162	+	shouldThrow();
163	+	} catch (InterruptedException success) {}
164	+	assertFalse(Thread.interrupted());
165
166	<	/**
167	<	* put blocks interruptibly if no active taker
168	<	*/
169	<	public void testFairBlockingPut() {
170	<	Thread t = new Thread(new Runnable() {
171	<	public void run() {
172	<	try {
173	<	SynchronousQueue q = new SynchronousQueue(true);
174	<	q.put(zero);
175	<	threadShouldThrow();
176	<	} catch (InterruptedException ie){
177	<	}
178	<	}});
179	<	t.start();
180	<	try {
181	<	Thread.sleep(SHORT_DELAY_MS);
182	<	t.interrupt();
183	<	t.join();
284	<	}
285	<	catch (InterruptedException ie) {
286	<	unexpectedException();
287	<	}
288	<	}
289	<
290	<	/**
291	<	* put blocks waiting for take
292	<	*/
293	<	public void testFairPutWithTake() {
294	<	final SynchronousQueue q = new SynchronousQueue(true);
295	<	Thread t = new Thread(new Runnable() {
296	<	public void run() {
297	<	int added = 0;
298	<	try {
299	<	q.put(new Object());
300	<	++added;
301	<	q.put(new Object());
302	<	++added;
303	<	q.put(new Object());
304	<	++added;
305	<	q.put(new Object());
306	<	++added;
307	<	threadShouldThrow();
308	<	} catch (InterruptedException e){
309	<	assertTrue(added >= 1);
310	<	}
311	<	}
312	<	});
313	<	try {
314	<	t.start();
315	<	Thread.sleep(SHORT_DELAY_MS);
316	<	q.take();
317	<	Thread.sleep(SHORT_DELAY_MS);
318	<	t.interrupt();
319	<	t.join();
320	<	} catch (Exception e){
321	<	unexpectedException();
322	<	}
166	>	pleaseInterrupt.countDown();
167	>	try {
168	>	q.put(ninetynine);
169	>	shouldThrow();
170	>	} catch (InterruptedException success) {}
171	>	assertFalse(Thread.interrupted());
172	>	}});
173	>
174	>	await(pleaseTake);
175	>	mustEqual(0, q.remainingCapacity());
176	>	try { assertSame(one, q.take()); }
177	>	catch (InterruptedException e) { threadUnexpectedException(e); }
178	>
179	>	await(pleaseInterrupt);
180	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
181	>	t.interrupt();
182	>	awaitTermination(t);
183	>	mustEqual(0, q.remainingCapacity());
184		}
185
186		/**
187		* timed offer times out if elements not taken
188		*/
189	<	public void testFairTimedOffer() {
190	<	final SynchronousQueue q = new SynchronousQueue(true);
191	<	Thread t = new Thread(new Runnable() {
192	<	public void run() {
193	<	try {
194	<
195	<	threadAssertFalse(q.offer(new Object(), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
335	<	q.offer(new Object(), LONG_DELAY_MS, TimeUnit.MILLISECONDS);
336	<	threadShouldThrow();
337	<	} catch (InterruptedException success){}
338	<	}
339	<	});
189	>	public void testTimedOffer() {
190	>	final boolean fair = randomBoolean();
191	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
192	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
193	>	Thread t = newStartedThread(new CheckedRunnable() {
194	>	public void realRun() throws InterruptedException {
195	>	long startTime = System.nanoTime();
196
197	<	try {
198	<	t.start();
343	<	Thread.sleep(SMALL_DELAY_MS);
344	<	t.interrupt();
345	<	t.join();
346	<	} catch (Exception e){
347	<	unexpectedException();
348	<	}
349	<	}
197	>	assertFalse(q.offer(zero, timeoutMillis(), MILLISECONDS));
198	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
199
200	+	Thread.currentThread().interrupt();
201	+	try {
202	+	q.offer(one, randomTimeout(), randomTimeUnit());
203	+	shouldThrow();
204	+	} catch (InterruptedException success) {}
205	+	assertFalse(Thread.interrupted());
206
207	<	/**
208	<	* take blocks interruptibly when empty
209	<	*/
210	<	public void testFairTakeFromEmpty() {
211	<	final SynchronousQueue q = new SynchronousQueue(true);
212	<	Thread t = new Thread(new Runnable() {
213	<	public void run() {
214	<	try {
215	<	q.take();
216	<	threadShouldThrow();
217	<	} catch (InterruptedException success){ }
218	<	}
364	<	});
365	<	try {
366	<	t.start();
367	<	Thread.sleep(SHORT_DELAY_MS);
368	<	t.interrupt();
369	<	t.join();
370	<	} catch (Exception e){
371	<	unexpectedException();
372	<	}
207	>	pleaseInterrupt.countDown();
208	>	try {
209	>	q.offer(two, LONGER_DELAY_MS, MILLISECONDS);
210	>	shouldThrow();
211	>	} catch (InterruptedException success) {}
212	>	assertFalse(Thread.interrupted());
213	>	}});
214	>
215	>	await(pleaseInterrupt);
216	>	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
217	>	t.interrupt();
218	>	awaitTermination(t);
219		}
220
221		/**
222	<	* poll fails unless active taker
222	>	* poll return null if no active putter
223		*/
224	<	public void testPoll() {
225	<	SynchronousQueue q = new SynchronousQueue();
226	<	assertNull(q.poll());
224	>	public void testPoll()      { testPoll(false); }
225	>	public void testPoll_fair() { testPoll(true); }
226	>	public void testPoll(boolean fair) {
227	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
228	>	assertNull(q.poll());
229		}
230
231		/**
232	<	* timed pool with zero timeout times out if no active taker
232	>	* timed poll with zero timeout times out if no active putter
233		*/
234	<	public void testTimedPoll0() {
235	<	try {
236	<	SynchronousQueue q = new SynchronousQueue();
237	<	assertNull(q.poll(0, TimeUnit.MILLISECONDS));
238	<	} catch (InterruptedException e){
239	<	unexpectedException();
392	<	}
234	>	public void testTimedPoll0()      { testTimedPoll0(false); }
235	>	public void testTimedPoll0_fair() { testTimedPoll0(true); }
236	>	public void testTimedPoll0(boolean fair) {
237	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
238	>	try { assertNull(q.poll(0, MILLISECONDS)); }
239	>	catch (InterruptedException e) { threadUnexpectedException(e); }
240		}
241
242		/**
243	<	* timed pool with nonzero timeout times out if no active taker
243	>	* timed poll with nonzero timeout times out if no active putter
244		*/
245		public void testTimedPoll() {
246	<	try {
247	<	SynchronousQueue q = new SynchronousQueue();
248	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
249	<	} catch (InterruptedException e){
250	<	unexpectedException();
251	<	}
405	<	}
406	<
407	<	/**
408	<	* Interrupted timed poll throws InterruptedException instead of
409	<	* returning timeout status
410	<	*/
411	<	public void testInterruptedTimedPoll() {
412	<	Thread t = new Thread(new Runnable() {
413	<	public void run() {
414	<	try {
415	<	SynchronousQueue q = new SynchronousQueue();
416	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
417	<	} catch (InterruptedException success){
418	<	}
419	<	}});
420	<	t.start();
421	<	try {
422	<	Thread.sleep(SHORT_DELAY_MS);
423	<	t.interrupt();
424	<	t.join();
425	<	}
426	<	catch (InterruptedException ie) {
427	<	unexpectedException();
428	<	}
246	>	final boolean fair = randomBoolean();
247	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
248	>	final long startTime = System.nanoTime();
249	>	try { assertNull(q.poll(timeoutMillis(), MILLISECONDS)); }
250	>	catch (InterruptedException e) { threadUnexpectedException(e); }
251	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
252		}
253
254		/**
255	<	*  timed poll before a delayed offer fails; after offer succeeds;
256	<	*  on interruption throws
255	>	* timed poll before a delayed offer times out, returning null;
256	>	* after offer succeeds; on interruption throws
257		*/
258		public void testTimedPollWithOffer() {
259	<	final SynchronousQueue q = new SynchronousQueue();
260	<	Thread t = new Thread(new Runnable() {
261	<	public void run() {
262	<	try {
263	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
264	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
265	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
266	<	threadShouldThrow();
267	<	} catch (InterruptedException success) { }
268	<	}
269	<	});
270	<	try {
271	<	t.start();
449	<	Thread.sleep(SMALL_DELAY_MS);
450	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
451	<	t.interrupt();
452	<	t.join();
453	<	} catch (Exception e){
454	<	unexpectedException();
455	<	}
456	<	}
259	>	final boolean fair = randomBoolean();
260	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
261	>	final CountDownLatch pleaseOffer = new CountDownLatch(1);
262	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
263	>	Thread t = newStartedThread(new CheckedRunnable() {
264	>	public void realRun() throws InterruptedException {
265	>	long startTime = System.nanoTime();
266	>	assertNull(q.poll(timeoutMillis(), MILLISECONDS));
267	>	assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
268	>
269	>	pleaseOffer.countDown();
270	>	startTime = System.nanoTime();
271	>	assertSame(zero, q.poll(LONG_DELAY_MS, MILLISECONDS));
272
273	<	/**
274	<	* Interrupted timed poll throws InterruptedException instead of
275	<	* returning timeout status
276	<	*/
277	<	public void testFairInterruptedTimedPoll() {
278	<	Thread t = new Thread(new Runnable() {
464	<	public void run() {
465	<	try {
466	<	SynchronousQueue q = new SynchronousQueue(true);
467	<	assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
468	<	} catch (InterruptedException success){
469	<	}
470	<	}});
471	<	t.start();
472	<	try {
473	<	Thread.sleep(SHORT_DELAY_MS);
474	<	t.interrupt();
475	<	t.join();
476	<	}
477	<	catch (InterruptedException ie) {
478	<	unexpectedException();
479	<	}
480	<	}
273	>	Thread.currentThread().interrupt();
274	>	try {
275	>	q.poll(randomTimeout(), randomTimeUnit());
276	>	shouldThrow();
277	>	} catch (InterruptedException success) {}
278	>	assertFalse(Thread.interrupted());
279
280	<	/**
281	<	*  timed poll before a delayed offer fails; after offer succeeds;
282	<	*  on interruption throws
283	<	*/
284	<	public void testFairTimedPollWithOffer() {
285	<	final SynchronousQueue q = new SynchronousQueue(true);
286	<	Thread t = new Thread(new Runnable() {
287	<	public void run() {
288	<	try {
491	<	threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
492	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
493	<	q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
494	<	threadShouldThrow();
495	<	} catch (InterruptedException success) { }
496	<	}
497	<	});
498	<	try {
499	<	t.start();
500	<	Thread.sleep(SMALL_DELAY_MS);
501	<	assertTrue(q.offer(zero, SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
502	<	t.interrupt();
503	<	t.join();
504	<	} catch (Exception e){
505	<	unexpectedException();
506	<	}
507	<	}
280	>	pleaseInterrupt.countDown();
281	>	try {
282	>	q.poll(LONG_DELAY_MS, MILLISECONDS);
283	>	shouldThrow();
284	>	} catch (InterruptedException success) {}
285	>	assertFalse(Thread.interrupted());
286	>
287	>	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
288	>	}});
289
290	+	await(pleaseOffer);
291	+	long startTime = System.nanoTime();
292	+	try { assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS)); }
293	+	catch (InterruptedException e) { threadUnexpectedException(e); }
294	+	assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
295	+
296	+	await(pleaseInterrupt);
297	+	if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
298	+	t.interrupt();
299	+	awaitTermination(t);
300	+	}
301
302		/**
303	<	* peek returns null
303	>	* peek() returns null if no active putter
304		*/
305	<	public void testPeek() {
306	<	SynchronousQueue q = new SynchronousQueue();
307	<	assertNull(q.peek());
305	>	public void testPeek()      { testPeek(false); }
306	>	public void testPeek_fair() { testPeek(true); }
307	>	public void testPeek(boolean fair) {
308	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
309	>	assertNull(q.peek());
310		}
311
312		/**
313	<	* element throws NSEE
313	>	* element() throws NoSuchElementException if no active putter
314		*/
315	<	public void testElement() {
316	<	SynchronousQueue q = new SynchronousQueue();
315	>	public void testElement()      { testElement(false); }
316	>	public void testElement_fair() { testElement(true); }
317	>	public void testElement(boolean fair) {
318	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
319		try {
320		q.element();
321		shouldThrow();
322	<	}
527	<	catch (NoSuchElementException success) {}
322	>	} catch (NoSuchElementException success) {}
323		}
324
325		/**
326	<	* remove throws NSEE if no active taker
326	>	* remove() throws NoSuchElementException if no active putter
327		*/
328	<	public void testRemove() {
329	<	SynchronousQueue q = new SynchronousQueue();
328	>	public void testRemove()      { testRemove(false); }
329	>	public void testRemove_fair() { testRemove(true); }
330	>	public void testRemove(boolean fair) {
331	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
332		try {
333		q.remove();
334		shouldThrow();
335	<	} catch (NoSuchElementException success){
539	<	}
540	<	}
541	<
542	<	/**
543	<	* remove(x) returns false
544	<	*/
545	<	public void testRemoveElement() {
546	<	SynchronousQueue q = new SynchronousQueue();
547	<	assertFalse(q.remove(zero));
548	<	assertTrue(q.isEmpty());
335	>	} catch (NoSuchElementException success) {}
336		}
337
338		/**
339		* contains returns false
340		*/
341	<	public void testContains() {
342	<	SynchronousQueue q = new SynchronousQueue();
341	>	public void testContains()      { testContains(false); }
342	>	public void testContains_fair() { testContains(true); }
343	>	public void testContains(boolean fair) {
344	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
345		assertFalse(q.contains(zero));
346		}
347
348		/**
349		* clear ensures isEmpty
350		*/
351	<	public void testClear() {
352	<	SynchronousQueue q = new SynchronousQueue();
351	>	public void testClear()      { testClear(false); }
352	>	public void testClear_fair() { testClear(true); }
353	>	public void testClear(boolean fair) {
354	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
355		q.clear();
356		assertTrue(q.isEmpty());
357		}
#	Line 568 | Line 359 | public class SynchronousQueueTest extend
359		/**
360		* containsAll returns false unless empty
361		*/
362	<	public void testContainsAll() {
363	<	SynchronousQueue q = new SynchronousQueue();
364	<	Integer[] empty = new Integer[0];
362	>	public void testContainsAll()      { testContainsAll(false); }
363	>	public void testContainsAll_fair() { testContainsAll(true); }
364	>	public void testContainsAll(boolean fair) {
365	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
366	>	Item[] empty = new Item[0];
367		assertTrue(q.containsAll(Arrays.asList(empty)));
368	<	Integer[] ints = new Integer[1]; ints[0] = zero;
369	<	assertFalse(q.containsAll(Arrays.asList(ints)));
368	>	Item[] items = new Item[1]; items[0] = zero;
369	>	assertFalse(q.containsAll(Arrays.asList(items)));
370		}
371
372		/**
373		* retainAll returns false
374		*/
375	<	public void testRetainAll() {
376	<	SynchronousQueue q = new SynchronousQueue();
377	<	Integer[] empty = new Integer[0];
375	>	public void testRetainAll()      { testRetainAll(false); }
376	>	public void testRetainAll_fair() { testRetainAll(true); }
377	>	public void testRetainAll(boolean fair) {
378	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
379	>	Item[] empty = new Item[0];
380		assertFalse(q.retainAll(Arrays.asList(empty)));
381	<	Integer[] ints = new Integer[1]; ints[0] = zero;
382	<	assertFalse(q.retainAll(Arrays.asList(ints)));
381	>	Item[] items = new Item[1]; items[0] = zero;
382	>	assertFalse(q.retainAll(Arrays.asList(items)));
383		}
384
385		/**
386		* removeAll returns false
387		*/
388	<	public void testRemoveAll() {
389	<	SynchronousQueue q = new SynchronousQueue();
390	<	Integer[] empty = new Integer[0];
388	>	public void testRemoveAll()      { testRemoveAll(false); }
389	>	public void testRemoveAll_fair() { testRemoveAll(true); }
390	>	public void testRemoveAll(boolean fair) {
391	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
392	>	Item[] empty = new Item[0];
393		assertFalse(q.removeAll(Arrays.asList(empty)));
394	<	Integer[] ints = new Integer[1]; ints[0] = zero;
395	<	assertFalse(q.containsAll(Arrays.asList(ints)));
394	>	Item[] items = new Item[1]; items[0] = zero;
395	>	assertFalse(q.containsAll(Arrays.asList(items)));
396		}
397
601	–
398		/**
399		* toArray is empty
400		*/
401	<	public void testToArray() {
402	<	SynchronousQueue q = new SynchronousQueue();
403	<	Object[] o = q.toArray();
404	<	assertEquals(o.length, 0);
401	>	public void testToArray()      { testToArray(false); }
402	>	public void testToArray_fair() { testToArray(true); }
403	>	public void testToArray(boolean fair) {
404	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
405	>	Object[] o = q.toArray();
406	>	mustEqual(0, o.length);
407		}
408
409		/**
410	<	* toArray(a) is nulled at position 0
411	<	*/
412	<	public void testToArray2() {
413	<	SynchronousQueue q = new SynchronousQueue();
414	<	Integer[] ints = new Integer[1];
415	<	assertNull(ints[0]);
410	>	* toArray(Item array) returns its argument with the first
411	>	* element (if present) nulled out
412	>	*/
413	>	public void testToArray2()      { testToArray2(false); }
414	>	public void testToArray2_fair() { testToArray2(true); }
415	>	public void testToArray2(boolean fair) {
416	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
417	>	Item[] a;
418	>
419	>	a = new Item[0];
420	>	assertSame(a, q.toArray(a));
421	>
422	>	a = new Item[3];
423	>	Arrays.fill(a, fortytwo);
424	>	assertSame(a, q.toArray(a));
425	>	assertNull(a[0]);
426	>	for (int i = 1; i < a.length; i++)
427	>	mustEqual(42, a[i]);
428		}
429
430		/**
431		* toArray(null) throws NPE
432		*/
433	<	public void testToArray_BadArg() {
434	<	try {
435	<	SynchronousQueue q = new SynchronousQueue();
436	<	Object o[] = q.toArray(null);
437	<	shouldThrow();
438	<	} catch (NullPointerException success){}
433	>	public void testToArray_null()      { testToArray_null(false); }
434	>	public void testToArray_null_fair() { testToArray_null(true); }
435	>	public void testToArray_null(boolean fair) {
436	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
437	>	try {
438	>	Object[] unused = q.toArray((Object[])null);
439	>	shouldThrow();
440	>	} catch (NullPointerException success) {}
441		}
442
631	–
443		/**
444		* iterator does not traverse any elements
445		*/
446	<	public void testIterator() {
447	<	SynchronousQueue q = new SynchronousQueue();
448	<	Iterator it = q.iterator();
449	<	assertFalse(it.hasNext());
639	<	try {
640	<	Object x = it.next();
641	<	shouldThrow();
642	<	}
643	<	catch (NoSuchElementException success) {}
446	>	public void testIterator()      { testIterator(false); }
447	>	public void testIterator_fair() { testIterator(true); }
448	>	public void testIterator(boolean fair) {
449	>	assertIteratorExhausted(new SynchronousQueue<Item>(fair).iterator());
450		}
451
452		/**
453	<	* iterator remove throws ISE
453	>	* iterator remove throws IllegalStateException
454		*/
455	<	public void testIteratorRemove() {
456	<	SynchronousQueue q = new SynchronousQueue();
457	<	Iterator it = q.iterator();
455	>	public void testIteratorRemove()      { testIteratorRemove(false); }
456	>	public void testIteratorRemove_fair() { testIteratorRemove(true); }
457	>	public void testIteratorRemove(boolean fair) {
458	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
459	>	Iterator<? extends Item> it = q.iterator();
460		try {
461		it.remove();
462		shouldThrow();
463	<	}
656	<	catch (IllegalStateException success) {}
463	>	} catch (IllegalStateException success) {}
464		}
465
466		/**
467		* toString returns a non-null string
468		*/
469	<	public void testToString() {
470	<	SynchronousQueue q = new SynchronousQueue();
469	>	public void testToString()      { testToString(false); }
470	>	public void testToString_fair() { testToString(true); }
471	>	public void testToString(boolean fair) {
472	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
473		String s = q.toString();
474		assertNotNull(s);
475		}
476
668	–
477		/**
478		* offer transfers elements across Executor tasks
479		*/
480	<	public void testOfferInExecutor() {
481	<	final SynchronousQueue q = new SynchronousQueue();
482	<	ExecutorService executor = Executors.newFixedThreadPool(2);
483	<	final Integer one = new Integer(1);
484	<
485	<	executor.execute(new Runnable() {
486	<	public void run() {
487	<	threadAssertFalse(q.offer(one));
488	<	try {
489	<	threadAssertTrue(q.offer(one, MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
490	<	threadAssertEquals(0, q.remainingCapacity());
491	<	}
492	<	catch (InterruptedException e) {
493	<	threadUnexpectedException();
494	<	}
687	<	}
688	<	});
689	<
690	<	executor.execute(new Runnable() {
691	<	public void run() {
692	<	try {
693	<	Thread.sleep(SMALL_DELAY_MS);
694	<	threadAssertEquals(one, q.take());
695	<	}
696	<	catch (InterruptedException e) {
697	<	threadUnexpectedException();
698	<	}
699	<	}
700	<	});
701	<
702	<	joinPool(executor);
703	<
704	<	}
705	<
706	<	/**
707	<	* poll retrieves elements across Executor threads
708	<	*/
709	<	public void testPollInExecutor() {
710	<	final SynchronousQueue q = new SynchronousQueue();
711	<	ExecutorService executor = Executors.newFixedThreadPool(2);
712	<	executor.execute(new Runnable() {
713	<	public void run() {
714	<	threadAssertNull(q.poll());
715	<	try {
716	<	threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
717	<	threadAssertTrue(q.isEmpty());
718	<	}
719	<	catch (InterruptedException e) {
720	<	threadUnexpectedException();
721	<	}
722	<	}
723	<	});
724	<
725	<	executor.execute(new Runnable() {
726	<	public void run() {
727	<	try {
728	<	Thread.sleep(SMALL_DELAY_MS);
729	<	q.put(new Integer(1));
730	<	}
731	<	catch (InterruptedException e) {
732	<	threadUnexpectedException();
733	<	}
734	<	}
735	<	});
736	<
737	<	joinPool(executor);
738	<	}
480	>	public void testOfferInExecutor()      { testOfferInExecutor(false); }
481	>	public void testOfferInExecutor_fair() { testOfferInExecutor(true); }
482	>	public void testOfferInExecutor(boolean fair) {
483	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
484	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
485	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
486	>	try (PoolCleaner cleaner = cleaner(executor)) {
487	>
488	>	executor.execute(new CheckedRunnable() {
489	>	public void realRun() throws InterruptedException {
490	>	assertFalse(q.offer(one));
491	>	threadsStarted.await();
492	>	assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS));
493	>	mustEqual(0, q.remainingCapacity());
494	>	}});
495
496	<	/**
497	<	* a deserialized serialized queue is usable
498	<	*/
499	<	public void testSerialization() {
500	<	SynchronousQueue q = new SynchronousQueue();
745	<	try {
746	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
747	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
748	<	out.writeObject(q);
749	<	out.close();
750	<
751	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
752	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
753	<	SynchronousQueue r = (SynchronousQueue)in.readObject();
754	<	assertEquals(q.size(), r.size());
755	<	while (!q.isEmpty())
756	<	assertEquals(q.remove(), r.remove());
757	<	} catch (Exception e){
758	<	e.printStackTrace();
759	<	unexpectedException();
496	>	executor.execute(new CheckedRunnable() {
497	>	public void realRun() throws InterruptedException {
498	>	threadsStarted.await();
499	>	assertSame(one, q.take());
500	>	}});
501		}
502		}
503
504		/**
505	<	* drainTo(null) throws NPE
505	>	* timed poll retrieves elements across Executor threads
506		*/
507	<	public void testDrainToNull() {
508	<	SynchronousQueue q = new SynchronousQueue();
509	<	try {
510	<	q.drainTo(null);
511	<	shouldThrow();
512	<	} catch (NullPointerException success) {
507	>	public void testPollInExecutor()      { testPollInExecutor(false); }
508	>	public void testPollInExecutor_fair() { testPollInExecutor(true); }
509	>	public void testPollInExecutor(boolean fair) {
510	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
511	>	final CheckedBarrier threadsStarted = new CheckedBarrier(2);
512	>	final ExecutorService executor = Executors.newFixedThreadPool(2);
513	>	try (PoolCleaner cleaner = cleaner(executor)) {
514	>	executor.execute(new CheckedRunnable() {
515	>	public void realRun() throws InterruptedException {
516	>	assertNull(q.poll());
517	>	threadsStarted.await();
518	>	assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
519	>	assertTrue(q.isEmpty());
520	>	}});
521	>
522	>	executor.execute(new CheckedRunnable() {
523	>	public void realRun() throws InterruptedException {
524	>	threadsStarted.await();
525	>	q.put(one);
526	>	}});
527		}
528		}
529
530		/**
531	<	* drainTo(this) throws IAE
531	>	* a deserialized/reserialized queue is usable
532		*/
533	<	public void testDrainToSelf() {
534	<	SynchronousQueue q = new SynchronousQueue();
535	<	try {
536	<	q.drainTo(q);
537	<	shouldThrow();
538	<	} catch (IllegalArgumentException success) {
533	>	public void testSerialization() {
534	>	final SynchronousQueue<Item> x = new SynchronousQueue<Item>();
535	>	final SynchronousQueue<Item> y = new SynchronousQueue<Item>(false);
536	>	final SynchronousQueue<Item> z = new SynchronousQueue<Item>(true);
537	>	assertSerialEquals(x, y);
538	>	assertNotSerialEquals(x, z);
539	>	SynchronousQueue[] rqs = { x, y, z };
540	>	@SuppressWarnings("unchecked")
541	>	SynchronousQueue<Item>[] qs = (SynchronousQueue<Item>[])rqs;
542	>	for (SynchronousQueue<Item> q : qs) {
543	>	SynchronousQueue<Item> clone = serialClone(q);
544	>	assertNotSame(q, clone);
545	>	assertSerialEquals(q, clone);
546	>	assertTrue(clone.isEmpty());
547	>	mustEqual(0, clone.size());
548	>	mustEqual(0, clone.remainingCapacity());
549	>	assertFalse(clone.offer(zero));
550		}
551		}
552
553		/**
554		* drainTo(c) of empty queue doesn't transfer elements
555		*/
556	<	public void testDrainTo() {
557	<	SynchronousQueue q = new SynchronousQueue();
558	<	ArrayList l = new ArrayList();
556	>	public void testDrainTo()      { testDrainTo(false); }
557	>	public void testDrainTo_fair() { testDrainTo(true); }
558	>	public void testDrainTo(boolean fair) {
559	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
560	>	ArrayList<Item> l = new ArrayList<Item>();
561		q.drainTo(l);
562	<	assertEquals(q.size(), 0);
563	<	assertEquals(l.size(), 0);
562	>	mustEqual(0, q.size());
563	>	mustEqual(0, l.size());
564		}
565
566		/**
567		* drainTo empties queue, unblocking a waiting put.
568		*/
569	<	public void testDrainToWithActivePut() {
570	<	final SynchronousQueue q = new SynchronousQueue();
571	<	Thread t = new Thread(new Runnable() {
572	<	public void run() {
573	<	try {
574	<	q.put(new Integer(1));
575	<	} catch (InterruptedException ie){
576	<	threadUnexpectedException();
577	<	}
578	<	}
579	<	});
580	<	try {
813	<	t.start();
814	<	ArrayList l = new ArrayList();
815	<	Thread.sleep(SHORT_DELAY_MS);
569	>	public void testDrainToWithActivePut()      { testDrainToWithActivePut(false); }
570	>	public void testDrainToWithActivePut_fair() { testDrainToWithActivePut(true); }
571	>	public void testDrainToWithActivePut(boolean fair) {
572	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>(fair);
573	>	Thread t = newStartedThread(new CheckedRunnable() {
574	>	public void realRun() throws InterruptedException {
575	>	q.put(one);
576	>	}});
577	>
578	>	ArrayList<Item> l = new ArrayList<Item>();
579	>	long startTime = System.nanoTime();
580	>	while (l.isEmpty()) {
581		q.drainTo(l);
582	<	assertTrue(l.size() <= 1);
583	<	if (l.size() > 0)
584	<	assertEquals(l.get(0), new Integer(1));
585	<	t.join();
586	<	assertTrue(l.size() <= 1);
587	<	} catch (Exception e){
588	<	unexpectedException();
824	<	}
582	>	if (millisElapsedSince(startTime) > LONG_DELAY_MS)
583	>	fail("timed out");
584	>	Thread.yield();
585	>	}
586	>	mustEqual(1, l.size());
587	>	assertSame(one, l.get(0));
588	>	awaitTermination(t);
589		}
590
591		/**
592	<	* drainTo(null, n) throws NPE
829	<	*/
830	<	public void testDrainToNullN() {
831	<	SynchronousQueue q = new SynchronousQueue();
832	<	try {
833	<	q.drainTo(null, 0);
834	<	shouldThrow();
835	<	} catch (NullPointerException success) {
836	<	}
837	<	}
838	<
839	<	/**
840	<	* drainTo(this, n) throws IAE
592	>	* drainTo(c, n) empties up to n elements of queue into c
593		*/
594	<	public void testDrainToSelfN() {
595	<	SynchronousQueue q = new SynchronousQueue();
596	<	try {
597	<	q.drainTo(q, 0);
598	<	shouldThrow();
599	<	} catch (IllegalArgumentException success) {
600	<	}
594	>	public void testDrainToN() throws InterruptedException {
595	>	final SynchronousQueue<Item> q = new SynchronousQueue<Item>();
596	>	Thread t1 = newStartedThread(new CheckedRunnable() {
597	>	public void realRun() throws InterruptedException {
598	>	q.put(one);
599	>	}});
600	>
601	>	Thread t2 = newStartedThread(new CheckedRunnable() {
602	>	public void realRun() throws InterruptedException {
603	>	q.put(two);
604	>	}});
605	>
606	>	ArrayList<Item> l = new ArrayList<Item>();
607	>	int drained;
608	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
609	>	mustEqual(1, drained);
610	>	mustEqual(1, l.size());
611	>	while ((drained = q.drainTo(l, 1)) == 0) Thread.yield();
612	>	mustEqual(1, drained);
613	>	mustEqual(2, l.size());
614	>	assertTrue(l.contains(one));
615	>	assertTrue(l.contains(two));
616	>	awaitTermination(t1);
617	>	awaitTermination(t2);
618		}
619
620		/**
621	<	* drainTo(c, n) empties up to n elements of queue into c
622	<	*/
623	<	public void testDrainToN() {
624	<	final SynchronousQueue q = new SynchronousQueue();
625	<	Thread t1 = new Thread(new Runnable() {
626	<	public void run() {
858	<	try {
859	<	q.put(one);
860	<	} catch (InterruptedException ie){
861	<	threadUnexpectedException();
862	<	}
863	<	}
864	<	});
865	<	Thread t2 = new Thread(new Runnable() {
866	<	public void run() {
867	<	try {
868	<	q.put(two);
869	<	} catch (InterruptedException ie){
870	<	threadUnexpectedException();
871	<	}
872	<	}
873	<	});
874	<
875	<	try {
876	<	t1.start();
877	<	t2.start();
878	<	ArrayList l = new ArrayList();
879	<	Thread.sleep(SHORT_DELAY_MS);
880	<	q.drainTo(l, 1);
881	<	assertTrue(l.size() == 1);
882	<	q.drainTo(l, 1);
883	<	assertTrue(l.size() == 2);
884	<	assertTrue(l.contains(one));
885	<	assertTrue(l.contains(two));
886	<	t1.join();
887	<	t2.join();
888	<	} catch (Exception e){
889	<	unexpectedException();
890	<	}
621	>	* remove(null), contains(null) always return false
622	>	*/
623	>	public void testNeverContainsNull() {
624	>	Collection<?> q = new SynchronousQueue<Item>();
625	>	assertFalse(q.contains(null));
626	>	assertFalse(q.remove(null));
627		}
628
893	–
629		}

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